Telephone-exchange system



TELEPHONE EXCHANGE SYSTEM. APPLICATION flu-:D :uns 14. 1919.

L. POLINKOWSKY.

framed Nov. 14, 1922.

Afp.

L. POLINKOWSKY.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE I4, I9l9.

L-mlqluuIl-HUI L. PoLlNKows'KY.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION r|LED1uN14,-1919.

Patented Nov. 14, 1922.'.

4 SHEETS-SHEET 8.

E L. PoLlNKowsKY.

TELEPHONE EXCHANGE SYSTEM.

MPucmou FILED lum-:'14, 1919.

1,435,333. PmmaN0v.14,1922.

4 SHEETS-SHEET 4.

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Lien roLINKcWsKY, or NNW non@ N. Y., nssisnoii 'ro wiisanasN PANY, INCORPORATED, or NNW YonK,

erica ELECTRIC CoM'. Y., A conPoisAteioN or NEWYYORK Application and June. 14.,

More particularly it relates to a system in which means are provided for establishing connections with lines of different cliarficter.,v such as subscribers7 lines local to a` give-n exchange or satellite and subscribers lines b elonging to a distant exchange.

An object of the invention is to provide for message registration in a system of this type with means for discriminating between different classes ot' calls`7` whereby it' a connection is extended to a line of one character7 the call is charged to the calling line but is not charged it a connection is established with `line of a different class.A

A feature ot the invention relates to an arrangement in which a. register cont-rolling mechanism, adapted to control the operation of selective switches, is capable ot discriminatia;0 between different classes ot ealls whereby message registers associated..witli the calling lines are operated when lines ot certain character are called whereas said registers are not operated when, lines of dili- 'lercnt character are called.

A. urther Y#feature of the invention relates` to an arrangement in which the register con-y trolling mechanism is capable of discriminating between calls of different character such that when a call is made to a certain class or' lines, means arey operated which later become effective to charge the call during release of the connection. l

A still further feature ot' the invention is the provisionv` in a system where a register controlling' mechanism in a switching sta.

tion is adapted to` control both the switches.

in said station and also the switches in a distant exchange, of means wherebgyv said controlling mechanism is arranged to dis-` tinguish. between local calls and calls to the distant exchange 'for thepiirpose of causing .lnsesent innen', on,- ak reistering arrz'ingenient is provided .wherel Ithat upon release of the 19.19. seiiai No, :ic/irai.

thebperation of the message' lregisters of calling lines when connections are extended to tlie'exchange lines. f i

Such other andk further features .contemplated by the present inventionv7 will become apparent from a consideration of the followingy description and the appended claims..

In thev drawings;v` l shows'a sub-1` the` multiple scribers line `terminating in terminals of a first line-finder .switch in a satellite and the circuitsfor operating` said finder switch. i v Q 2 illustra-tes ngdetail the circa-it arrangement of a second line ii'iider switch z a first group selector switch in the satelli-t 'together witlimeans for associating.av ree;- ister controlling: mechanism with y the cire cuits of the group selector.vv This ligure-also i. selector shows diagrammatically a' finalsw-i-tch having` access to called lines local to the satellite, and a first group selector, seca. distant exchange with a siibscribers line as are Y `.75 ond group Selector; a linal selector switch in s ot' the exchange leigminating in said final l selector switey 1 Figures. 3 and 4f illustrate in detail the ein. cuits and apparatus of a regi-ster controlling mechanism for controlling theoperation or?-` .the selector switches botli'in. the satellite and in-.the distant U s y In accordance .with tliewprinciples. of the i change. 1

extend. his line a subscriber' whose line belongstoa distant exchange, meansin the satellite are proyided for distingtnishinga cal-l of this nature so connection, the ines-` sagte register associatedv withl the lcallingi" 5 subscriber-s lineis operated; Y calli, To accomplish the,- end `generally `ontlmed above, the register `controlling.meel-ianisni in the satellite,y the functiony of which,

is'to controltlieselective operation of the switches, isso. designed as to be able to, distinguislrbetween` calls local ton-the satellite and calls outgoing todistant exch anges, either to withhold the to char O'e thel fi oo e application 'oit' axspecial source of metering current tor operating the message register during the release oit the connection or to prepare circuits for the connection ot such source to the message register, as 'the case may be.

-Sincethe discrimination by the register controlling mechanism is made to depend upon the particular positioning ot the individual registers of such mechanism under the control ot the calling siibscribers dial, or, in other words, dependent upon the chai'- acter ot the digits transmitted, tor causing message registration. in one case and tor preventing it in another, it is apparent that by suitable modifications, calls to any desired class oi lines may be charged, whereas calls ot other1 classes may bc made withoiit cliaiige.

The tirst line finder switches shown in l? ig. 1 and the second vline iinder switches shown in Fig. 2, are of the rotary powerdriven type arranged to be driven by a continuously operating source oft power, and are in general the same as those diselosedin the patent to Polinlrowslry 1,193,053, issued August 1, 1916, The selector switches shown in Fig. 2 are likewise designed to be operated by a continuous source of power and controlled in accordance with the welllrnown principle ot reverting impulses in a manner similar to the operation ot the switches shown in said patent.

rlhe register controlling equipment disclosed in Figures 3 and 4: comprises a plurality ot sequence switch registers, each having a series ot 10 controlling positions. These registers are arranged to be advanced from their normal or Zero position under the control ot impulses transmitted from the calling` siibscribers dial to positions corresponding to the number of impulses contained in each series. Having thus been positioned, the registers are then adapted to run through the remaining positions in their cycle, which number oil positions it will be observed is the complement oit the impulses sent trom-thc calling substation to control the selective operation oit the several selector switches. .irccordingly, it is apparent that in order to control the selector switches through a number oin selecting steps corresponding to the digit oi. the called number concerned, it is necessary to provide means tor setting the registers up to positions corresponding to the complementsV ot the digits rather than to position them in accordance with the actual digits ot 'the called number. This is readily acconiplished-by arranging the calling subscribers dial so as to send out series oit iinpulses corresponding to the complements of the digits' ot called numbers as they arev listed in the telephone directory. The operation ot a register controlling mechanism ot this character and the construction ci' the calling subscribers dials 'for cooperating therewith, has been described in detail in the British patent issued to lilVestern Electric Company, Limited, No. 146,517, accepted October 5, 1921.`

lt is believed that a more thorough understanding may be had ot this invention trom va detailed description ot the operation ot' the system in which it is embodied. p

lit will rst be considered that a subscriber, such as the subscriber ot line100 in the satellite, wishes to complete a talking connection with another subscribers line in the saine satellite, as tor example, line 200. (ln removing his receiver trom the switchhook, a circuit is completed troni battery through the lett-hand winding oi' line relay '101, contact and armature ott cut-oft1 relay 120 over the loop ot' the calling line inner armature and Contact olii' relay 120, through the right-hand winding otl relay 101 to ground. Relay 101 attracting its armature, places a selectable potential upon the multiple terminals, such as 109, in all iirst line iinders having access to the calling line. rltlie circuit over which this potential is placed upon terminals 109 leads through the inner windings ot the starting relays 102. llelays 102 are at the same time energized by means oit a circuit from battery 'through their inner windings, armature and Contact ot relay 101,l through the outer windings oit relays 102 to ground. The starting relays 102, by attracting their armatures, complete a circuit from ground through the winding` ot relay 103, and

lthence in parallel to the windings of the motor magnets such as 11e, of all .idle first line under switches in the group, back contact and armature ot relay 116, to battery over the back contact and armature ot relay f .119. 'llhe motor magnets 114: cause, .in the well-known manner, the rotation k'ot the brushes 110, 111, 112, 113, olf siii-h idle first line 'linder switches. (hi coming iii contact with the terminal 109 oil the calling line, upon 'which a selectable potentialexists, a circuit closed trom batteri.' through the inner windings ot relays 102. ariiiatiiic and contact of relay 101, test terminal 109, brush 113, 'through the right-hand high resistance winding ot test relay to ground..y

Relay 115 energi'fies and closes a low resistance circuit to ground through its letthaiid low resistance winding and Contact and armature and the winding` ot relay 110.

This low resistance path decreases thepotential on the test terminals ot other line finder switches to render the calling` line non-selectable. Relay 11G energizing, at the same time opens the circuit ot powerlinagnet 11+V to bring the brush carriage to rest with the brushes 110, 111, 112, 113, iipon terminals 106, 107. 10S` .109. and also'closes circuit troni battery, armature and back contact of rela-y 19arniature .and front Contact of relay 116, through the winding of ,thefhold-4 ing magnet 123, through windings of startiiigrelays 11T, tofground. rllhe holding magnet 12.3"seryes to accurately position the brushes 110, 111, 1,12, 113. Relay 11hv also closes a circuit 'from battery, arina.. ture and back contact oi relay 119, .armature and front contact of relay 11G, through the resistance 124, to the multiple terminals, such as 210, of all second line linderswitches having access toy the connecting circuit of the calling first line iider, thus placing a selectable potential thereon.

rlClie starting relays 11T,- by attracting their armatures, close a circuit troni ground through the winding of relay 118, conductor 125, and thence in parallel overV sequence switch contacts 244, or' thel second line linder switches having access tothe calling group, through the winding of relay 222 to battery and ground. Relay 222 closes a circuit troni ground, arma-ture and back contact of relay 231, armature and iront contact of relay 222, armature and baclr contact ot relay 232, through thegwinding of powerinagnet 242 of the second line. finder, contact (1) of sequence switch 220, to battery and ground. rlhe power magnet 242 energizing in this cir# cuit, operates torotate the brush carriage-oi the second line finder switch. When the test brush 230 of the vrotating brush carriage reaches test terininal` `210, a selectable potential, being found thereon, relay 234 is energized. The circuit :tor relay 234 extends troni tern'iinal 210 by way of brush 230, contact (1), through the right-hand high resistance winding of relay 234, back contact and lower armature of relay 224, contact 211 (1), contact 281,01.i sequence switch .2811, closed in positions 1 to `10 to ground.

Test relay 234 closes a low resistance path through its left-hand winding, Contact `and armature and winding ol relay 232 vtol ground, in parallel withl its high resistance winding. This serves to reducetlie potential on multiple terminals 210 to'render the calling circuit non-selectable. to other second. line linde.' switches. Relayv 232 which also Yenergizes, opens the circuit-of the power magnet 242 `to discontinue therotation of the finder brush :arriage and closes a circuit to .drive sequence rswitch 220r out ofpositioii 1 and .into position 4. This circuit mayhetraced quence switch 220.v Contact (1) front 'contact und arma-ture of rel 232; 'front Contact and ai'inature of relay 222 to ground lat buck Contact and armature oit relay7 As sequence switch 220 reaches position 3, and in the positions thereafter up to vposition 13, a circuit is closed .troinvground, con

from battery through the windingA of setuct 212. upper armature of relay 224,.

through the winding` oli relay 235. brush 238, through the winding oi relay 119,

`ot'coiitact 228 as sequence brush ,112,"terminall 108 through the winding `,cut-.oil relay 120V to battery .and ground. ltelay l120 opens the circuit or" line relay 101, which in ,turn permits the deenergiaation of the coininon starting relays 102, thereby causing `all other hunting lirst line linder switches 't'o cease their rotation. Relay 11/ energizingnin the above circuit, opens the circuitot the coniinon starting relays 117, which reinove the ground vtroni conductor 125., thuspreventing the vhunting of other. second line llnderj switches. In parallel'with the circuit traced for cut-oil.i wrelay 120, aI circuit is also coinpleted` through the winding or the message register ii'iagnet 1 21, which .is individua-l to the calling line 104, 105. This `inagnet, however, heilig of the marginal type, .does not lreceive sutilcieiit current in this circuit to energize. On` leaving position 2, sequence switch contact 244 opens to relay 222.- ln position, 3 ofv sequence switch 220, they above traced circuit for relays 235,

119 and 120, is closed and relay 235 energizing, closes the calling line over conductors 126, and12?` through to the cordcircuitot the second `line linder switch. `in- Fig. 2. Re

lay 231 is, therefore, :energized in series with the calling line and retardation coiln237,` in

position 3 or' sequence switch 220. Relay 231 being ener,f .izedv when sequence lswitch permit the deenergization of.

220 reaches position4, the ineter hindering i The object of this circnit'is to permit theA energization ol' relay224, to` prevent the reg-l istrationrof a call in the event `thatthe vcall?l subscriber abandons thecall when se-` qnence switch .220. is ,in position 4.

ln position 4 oie.r sequence switch 220, the.

selection of an idle register controlling inechanisii'i', such as the one sho yn linlligs.

3 and 4, takes place.: `v For'this purpose a..

testing sequence switch 28() is proyided to test the.. idle or busyv condition ot the register 'mechanisms and upon {ind-.ing an idle one,

to associate the sainewith the circuits shown in Fig. 2. lThe circuit for initiating the testingl operation of sequence,v switch. 280 eir- 1.

tends from battery through the winning of said sequencey switch, contact .back contactand armaturey of relay ,232, contact i 211 to ground at contact 281 of sequence4 switch 280.` lt will be noted that relays 234 and 232 are deenergized upon the opening switcli'22`0 passes out of position 3. rlhe circuits of the lieg ister inet-.hanisinscsuch as the one shown inr Figures 3 andare inultipled to corre-`-. spending contacts. as contacts 282,283 and 284. of a i plurality of testing sequence switches 280. v,The circuits oi" the register tra mechanism shown in the drawings are associated with the connecting circuits of the second line iinder and group selector when sequence switch 280 is in either position 1 or position 7. 1r, therefore, the register mechanism shown is idle when a sequence switch 280 reaches either position 1 or 7, a circuit is completed from battery, through the lett-hand winding of relay 323, contact 322 (1) o" sequence switch 320, conductor 293, contact 232, (approaching position 1) contact 213 (et), through the right-hand winding oit relay 23a, contact 281 of sequence switch 280, closed in its successive halt positions, to ground.

rlhe contacts 232 oi sequence switch are arranged so that the circuit closing positions extend over an angular distance su'l- ;icient to insure the closure et the above traced test circuit when Contact 281 is in one of its halt positions. rlhe details el this operation are shown and described in the patent to Polinlrowsky No. 1,160,441?, granted November 16, 1915. Relay 23/1 energizes and closes the low resistance circuit through its lett-hand windng, contact and armature, and through the winding et relay 232 to grounc. The low resistance of this circuit reduces the potential on the conductor 293 so as to prevent another sequence switch 280 from seizing' the selected register mechanism. Relay 232 energizes and opens the circuit of sequence switch 280. causing` the same to cease its rotation. Relay 232 also closes a circuitrrom battery through the wnding of sequence switch 220, contact 225 front contact and armature ot relay 232, Contact 211 (Il), to ground at contact` 231 closed in either position 1 or 7. rlhe sequence switch 220 leaves position Al and moves into position 53. lllhen rsequence switch 220 passes out of position t, it opens at contacts 221 and 223 the bridge across thc callingline through relay 231 and retardation4 ccil 23, permitting` relay 231 to he deenen Zed. The calling line .is now extended i' contacts 221 and 223, closed iii position. :1. to the stepping relay olE the selected register mechai'iism, re; j i'oi the i'i-ransinission o'll impulses to register the designation or the called line. The imiiulse circuit including stepping relay 325 is traceable from battery through the lett-hand winding of said relay, conductor 331, contact (1 or 7), of sequence switch 280, contact 223 (5), contact and lower armature oit relay 235, conductor 127, brush 111, terminal 107, conductor 105 over the loop of the 'calling line conductor 104, terminal 106, brush 110, conductor 126, upper arma-y ture and contact of relay 235, contact 221 (5), contact (1 or 7) of sequence switch 230, conductor 332.v through the winding of relay 325 to ground. y

it the time the registering mechanism was selected the relay 323 was energized in series with test relay 23e. A circuit was thereupon closed from ground, over the armature and front contact of relay 323, through the right-hand winding thereof, through the winding ol" sequence switch 320 to battery and ground. Sequence switch 320 moves out of position 1. 1n lea 'ing position 2, sequence switch 320 opens4 the original energizing circut of relay 323 at its Contact 322, permitting said relay to be deenergincd before sequence switch 320 reaches position. 3. Sequence switch 320 therefore, comes to rest iii position and at its contact 353 closes a' circuit ttor the interii.i] )ter 333, in series with the primary winding ot a dialing tone coil 337. es relay retracted its armature, acirciiit was closed 'from battery, contact 327- (3), through the winding ot relay 326, back contact and armature ott relay 323 to ground, cai-using` the energization of relay 326. lhen, therefore, stepping` relay becomes energized in series with the calling line, a circuit is closedv from ground, armature and front Contact el' relay 325,v armature and front contact oi'' relay 326, contact 330 (3), through the right-hand winding of differential relay 329, armature and contact ot such relay, contact 328 (3l, through the winding oli' the tens thousand register 4-00 to battery and ground. A parallel circuit to the one just traced is also completed treni battery through the left-hand winding or' differential relay 329 and thence to ground the armature and front contact of relay 325. Relay 329 being'` differential does not attract its armature when both of its wind ings are energized, The register li00, however, is energized and moves out ot position zero. Between vpositions zero and 1 ot register l100 a direct circuit to ground .is closed iii the well-known manner, by its local contact 01, thusV shunting the rightlianil winding of the diilerential relayl 329. This relay now attractsr its armature :ind iiegister 100, under the control ot its local contact, advances into'position 1. l'telay 342 also energizes in a circuit over contacts 323 (3) to ground atthe local contact L01 ot register 4100. Relay 311.2 remains energized `while register Z100 is passing from one position to another, and at its armature and Contact closes a holding circuit for relay 329, to insure that this relay will not deenergize until register 400 has reached its Jlull position.

The calling subscriber on hearing the distinctive dialing tone in his receiver, when sequence switch 320 moves from position 1 to position 3, knows that he may proceed with the manipulation oit his dial. Upon the first interruption of the calling line at the subscribers dial, relay 325 retractsits armature and opens the circuit ot the lettlsulostitiited circuit for the leit-l hand winding` et relay 329., ,vhieh relay becomes del-energized, the relay 342 having in the meantime deenergized, since register 400 has opened its local Contact `lOl., to open the )and Winding' of relay i 's the line circuit again closes register O0 energized once more and nieves out ot position 1,`relay 329 en-A ei'gizes. the register passes to position 2 and at the next interruption ot the line circuit relay 329 heeoines deenerg'ized. This' oper` ation continues, the register advancing one position tor each interruption ot the-line' is new completed from battery through thel left-hand Winding; oi relay to ground at the eontact and armature or relay 334e. Relay energizes and closes acireuit to drive sequence switch 320 out of position';

Betere sequence switch 320 can reach posi-j tien i te egainclose kContact 344, the line cir luitis closed at the subscrihers dial and relay 331ideenergizes to in turn permit the deenerrizntion ot rela),Y 823, whereby seeucnre switch 32() coines to rest in position 5. Relay S26, which had its circuit opened :it the hack Contact of relay 323, deenergized while 'sequence switch 320 was passing'rroiu position l to position As sequence switchl 320 misses thi-ouali oosition L the reo'ister l o. O0 is energize@` in a circuit lrorn battery*v through the Winding of this'register'.A eon'tact 225i (K4- eoutact and armature `and rit'hthund Hindi .e ot relay 3295 to ground' at eontmqt 330 (l). The register 400 advanees il l `ition to the position to which ser hg, he suhseribers sender. y 'llr, control et the' steppingT relay 325 is non' shi .ttefl from the tens thousand rebis tcr, to the' tliousnnds register V410. uis" soon :is relay 326 energizes upon the ztrriyall :i cirel" L\,'i ziirieiiize suf'iteh to position 5T lav 32T)7 contact et relayl 2326. Contact Ofi or' re tcrfilllh which :is will he hereinafter eK- plained. i closed iu either position 9 or posi'- ti'n (i.

of relay 329` contat -23'.(5) the Winiline ot' register 410 to ln a similar inenn'er to that deparallel circuit iselosed through 'lie ethunfil minding; et relayr 329, topi-'ef threes-h the windine' armature and front vent- .this'relay from ,attracting its armature. The register 41() moves out of vpositieni), Where it short-circuits theA riglithand windingof the differential relay to permit the energization oi this relay.

vdi/Then the subscriber operates his dial. toL

send the second seriesoiI impulses, the first interruption of the line circuit causes the release of relay 325', which in turn permits the deenergization oifrelay 329'.` The register 410 advances under the control ot'its local -contact to position 1.1 After each suecee'ding interruption of the line Circuit,

register 410 moves forward one position yand" at ithe last interruption relay 331i energizes to *anse the operation of relay 323. `The relay 323 then closes'a circuit over its armature Vand front Contact and drives sequence switch 520v out 'of position While sequence sivitch is moving' from position 5 to position the line circuit is again closed to clause the energiation of relay325` and the consequent deenergizatioii .oit relays 334 andl 323, Aso that sequence 'svviteh 820 ivill' frs relayy S26- is again energized a Circuit is completed froin'ground, arniatureland front Contactl or relay '325,` ern'iatureV and front cdntalfctfv or relay 326, contact 05 of register 400,

stop when it reaches position 8.

right-hand Winding and armature and contact of relay 829, sequence svvltchcontact (8), through the Winding,` of the'v hiin dreds register 420 to battery and 'rouiid.

The calling" subscriber operati y y inaceordance with the ,third'dig'riiJ of the de-v sired nurnher, causes the register le20I to he his dial advanced" to its proper position under the control or thestepping relay 3275; At the termination of the third series et impulses relay 354k is energized, Causing; the energization of 1-elay323`to close a circuit for driving' sequence siviteh 320 out oi position and nite position 10; A, circuit ,is thereupon completed from ground7 'armature' and iront contact or'relay 325, armature and front 'eon-' tact of' releyj326, Contact 405, right-hand Wilijdinzerand armature and Contact ii're'layl stili-,ch contati (lo) 329k sequence i550 to hatteryand ground; The' interrupof the tens register i rd tionof the line circuit during` the sending l oit the 'fourth sei'ie'sof impulses, causes the 'a drancey of register e30 under the control or stepping relay325; At `the endoftliis series sequence switch` S20/is energized in the man ner already described and moves from position 10 into posit-ion 12. @i circuit for the control of the units register fil() iscoinpleted of m1337325', armature and front'contelct relay 326, Contact 4105; iiglfitfhandviiindingisl and karmature or Contact ofrelv 329` seq uenee'switch Contact 336 (l2), tliriiglithe Winding' of unitsregzister 440 to battery 1nd ground. As the call-ing shseriberopeats iron'i ground, -ar'ina'ture and front Contact his dial in accordance with the .[inal digit, the stepping relay 325 operates as above de scribed to control the positioning of the register 4.40. The last interruption ot thc line being ot comparatively long duration, relay 334-. is energized and sequence switch 320 is driven ltrom position 12 into position ist.

ritter the first three series ot impulses have been sent trom the calling subscribers station and the iirst three registers advanced to their corresponding set positions group selection proceeded with, without waiting for the tens and units registers to be set. The first three registers 4:00, 410 and 420 and their associated circuits are capable ot discriminating whether the number that is being registered is that oi? a line local to the satellite or an exchange line.

rl`he capacity ot the present system is taken tor example to be 20,000 lines. These lines are numbered from 10,000 to 29,999, whereby the tens thousand register LL00 is utilized in only two ot its positions. -When the iirst digit ot a called number is l, which indicates that the called line belongs to the first tens thousand group, the register 400 is advanced under the control oi the calling dial to its ninth position, the complement of the desired digit, and thereafter advanced into its 0 position by means ot the circuit over contact 330 (4l), already described. the iirst digit ot the called number is 2, which indicates that such line belongs to the second tens thousand group, the register 400 is first advanced to the complementary position 8 and thereafter moved an additional step into itsv ninth position. Hence the contact li05 ot the register 400 will always be closed in either the ninth or the 0 position of the tens thousand register.

The subscribers lines belonging to the satellite of which, for the purpose of illustration, there will be considered to be 400 in the present system, are assigned tothe second group of 10,000 lines. Furthermore, these satellite lines are assigned to the second thousand in the second 10,000 group, which corresponds to the eighth position of register llt), and comprise the 8th, 7th, 6th and 5th groups or' 100 lines in the second thousand, which correspond to the second, third, :tourth and fifth positions ot register Li20. There- ,tor-e, when a call. is made to a line belonging to the satellite the register Ll0() is set to its Y ninth position, the register 410 to its eighth position and the register L20 to either its second. third, Yfourth or iiitth position.

The first three registers having been set, thesequence switch 320, it will be recalled, thereupon moves from position 8 to position 10. A circuit is then closed for the Sequence switch 350, which controls the restoration oil the positioned Aici-registers during' the selective movement of the switches. This circuit may be traced trom battery through the winding ot sequence switch magnet 350, contact 347 (l), contact 403 to ground at contact Sequence switch 350 leaves position 'l'. ln position Llo't sequence switch 350, a circuit is closed from battery, through the windings of relays 382 and 383, contact 406 (9), contact 410 (8)contact L27, closed in one ot` its positions from 2 to 5, contact 372 to ground. Relays 382 and 383 energize and lock up in a circuit from battery, through the windings of these relays and ront contact and leithand armature ot relay v383, to ground at contact 369 closed in positions 2 to 12. Sequence switch '350, therefore, continues to move over positions 2, 3 and and comes to rest in position 5 by means of a circuit closed from battery through the winding ol' such sequence switch, left-hand armature and contact or' relay. 382, sequence switch contact 380, closed in positions 2 to e, to ground at the front contact and right-hand armature of relay 382. At the same time relay 357 is energized in a circuit from battery through its winding, sequence switch contact 380 to ground at the right-handarmature oi? relay 382. Relay 357 serves to maintain the fundamental circuit open while sequence switch 350 is passing` to position 5.

As sequence switch 350 moves into position 2, the relay 359, which controls the restoration of the registers, is energized over its right-hand winding, contact and armature of relay 355, sequence switch contact 354, contact 451 to ground. Relay 359 by attracting its armature insures that the registers remain undisturbed until the fundamental circuit is in condition to control the group selector. f

In position 5 oit sequence switch 350, the relay 357 deenergizes and the fundamental circuit is completed from battery through the winding of relay 222 at the group selector in the satellite, contact 247 (5), contact 283, conductor 209, armature and contact of relay 357, through the winding ot the stepping relay 355, contact 380 (5), to ground at the iront contact and right-hand armature of relay 382. Relays and 355 both energize, the latter opening the circuit of relay 359, which thereupon lleenergizes. Relay 222 closes a circuit from battery i.through the winding ci sequence switch 220,

contact 225 (5), front contact and armature oi relay 222, to ground over the baci; contact and armature ot relay 231. Sequence switch 220 moves into position 6 where a circuit is closed -for the trip spindle power n'iagnet 248. This circuit may be traced from battery, through the winding of .magnet 248, contact 2M (6), winding of relay 278, :trontcontact and armature ot relay 222, to ground at back contact and armature oit relay 231..

The tripspindle rotates in the well-known manner, causing a short circuit tor the stepping relay 355 in the fundamental circuit for each brush tripping position. lVlien the relay 355 is first deenergized'as a. result of the short circuit produced by int'e'rrupter .2507 a circuit is establishedl lfrom battery through the winding' of the hundred register 420, contact 122, contact 366" (5), contact and armature and left-hand winding of relay 359 Contact and Varmature ot relay 355, contact a to ground at contact 451. ln parallel thereto a circuit is also closed through the righteha-nd wint1 to g'rouiidat contact 451. Therelay-359 is niad'e differential and7 therefore, doeslnot attract its armature when both winding-rs are energized. The register 420. howeverfis energized and inovcs out ol the position to which it was set from vthe calling'subscrib; ers station. ils soon as the local contact 421 is closed between positions, a direct circuit is closed to ground, thus lshort circuiting` the left-hand winding' of the differential relay 350, permitting' this relay to become ener. f gized. vThe register A120 continues to move vunder control ci its local contact, into the next position. y

As the brush tripping' spindle reaches its ii'st tripping position. the short vcircuit is removed at contact 250 and relay 355 once more energizes. Relay 355 opens the circuit for the right-hand winding` ot relay 359, which relay thereupon decneigizes. Register 4:20V is aga-in energized in the circuit above described including' the lett-hand winding ot relay Contact and. aiiiiature of stepping' relay 355 and contact $51. ltegister L20 advances through another position,` relay 355 is short-cii`.'cuited a second time by the interrupter 25() and relay 35S) becomes dcenerg'ized.` This operation continues until the registc e120 is il'ully restored Ato its O position. On the next deeiiergization of' relay 355 after register 420 has reached po'- sition O, a circuit is closed 'troni bat through the winding' of Sequence switch magnet 350, lett-hand armature and front contact ot i'elay'382. contact 364i (5). con

' tact 424, contact 366 contact and. ar-

mature vand lett-hand winding" o tl Arelay Contact und armature of relay Contact 254 to ground at' Contact 451.' ln parallel to tlie circuit ,just traced a circuit is also complet-ed tor yrelay 357. Sequence. switch 350 moves from position 5 into position 6. while Feb gizes to maintain the fundamental. circuit open. Aiter the interruptor` Contact 250 is' opened, relay 222deenergJZes and closes a' circuit troni battery through the winding ot.' sequence switch 2205 'i'foiitact 251] (6), back contact and armature ot 'rclay 222 to I`around at back Contact and armature ot relay 231. Sequence switch 220 passes into position '7.

The relay isnoiv energized in a circuit from battery through the winding of this ring ol rclay359,v

t ery final selector 217 relay, contact '213V {7)jcon`tact A282, conduce tor -2t'3.liaclr coiitactai'id aii'inature'ojf rela-yV 34e-O of sequence switch 320 to'l 339, Contact ground. *l A f ln position T oi sequence siiiitch 220, the power magnet 241 is energized by means of a circuit completed from battery through the windin'gycij said magnet, contact 227 back contact and armature of relayl front Contact and armature of relay\222, to.

,relay aan.v

teif'iiiinals. li' reaching rthe test terminal such as terminal 215, oi an idle trunk, a selecta-ble potential is found thereon and a circuit is closed over terminal 215,*b`rush 216,

Contact 228" (7), thifough the righteliand*v liiglrresist'ance windingoi test relay 234, contact and Vlower armature 0i. relay 22A7 contact 21.1 (7)7 to ground at contactb a ck 281. The 'test relay 234- energiz'es `and closes a low resistance circuit throughgits left-hand winding, contact andy armature and vthe winding- 'et' relay 232 to' ground iiiparallel to the circuit, through the right-hand wind# ingA ot relay 234. `This low resistance circuit l' so reduces the potential on the test terminals 215 as to render the selected trunk busy, to other group selectors. 'y y gizes and establishes a circuit'gi'rom'battery through the winding; of sequence switch 220, y

contact 225 (7), front contact and armature ot relay 332, front Contact of relayA 222i to ,eroundat hack contact and armature ot relay 231. Sequence switch 220 moves over position S andl into position 9, in -whic'lithe register controlling equipment is connected over contacts nal selector ot thesatellite, 'dia''g'raminati-v cally illustrated at 217."y The energiza'tioii of relay 232 also opens the aboye tracedcircuit for power magnet 24.1 to discontinue tlieop Relay 232 yalso ener- 255 and 2,47 through tothe [lio eration of the group selector brush carriage; y

The fundamental circuit vwhichfis pre# y pared by' sequence switch 220 advancing` into positionQ, is lieldopeii at the register mechanism until sequence switch 350 nieves into position 7, which only taires place alter 4 the tensl and units registers 4130 and have been iositifoiied fiomthe callin@r subscribefs i substation. After the units register has been set. it will be recalled, sequence switchv 320 advances into `position 14; lu1 this position.' circuit is completed from batteri through the winding of sequence switch 350..I

contact 347 `(6)1.fto `groundat lcontact'2E/t1 (145).; to' advance sequence switcli350 out'ot' position `o and into position'".A Y rill'ie 'imidamental circuitis thereby completed for the ii'i'icliiides,l as is wellilnofwin a relay corre-- sponding to rela-y222,I at the final selector This' fundamental 'circu it" yiso 217 and intends ver the brush 213 olf the groiui sel ctor, contact 255 (9), Contact 234, conductor 297,` right-hand armature and front contact o t relay 333, Contact 356 (7), through th* Winding olf stepipiing relay 355, Contact and armature of relay 357, conductor 269, Contact 233, contact 247 (9), brush 219, and thencev to ground at the inal selector 217.

Brush selection at the final selector 217 takes place, the stepping relay 355 being short-circuited by the interrupter contacts on the trip spindle to control the return of the tens register 430 to its 0 position. @n reaching position O, register 430 closes a circuit trom battery through the winding 01' sequence switch 350, lettdiand armature and contact ott'. relay 332, Contact 364 (7 contact 434 (0), contact 366 armature and lett-hand winding ot relay 359, contact and armature ot relayv 355, contact 354 to ground at contact 451. elay 357 is also energized in parallel to the cirrllhe sequence switch 350 moves 'from position 7 into position 9. Units selection now takes place at the linal selector, the stepping relay 355 in the undaH mental circuit being shortcircuited to intermittently release and attract its armature to control the return of the units register 440` to its O position. lWhen the brushes oic the final selector 217 have reached the terminals cuit just traced.

y of the called line 200, the register 44() being now in its 0 position, a circuit is completed from battery through the winding oit sequence switch 350, left-hand armature and contact of relay 382, cont-act 364 (9), contact 444 (0), back contact and armature or relay 343, contact 443 (0), contact'367 and thence to ground at Contact 451. Sequence switch 350 moves out of position 9 and into position 12.

rEhe manner in which the linal selector 217 in the satellite is operated to select the called line under the control of the tens and units registers 420 `and 440 and to thereupon test the idle condition of such line, is described in detail in the above mentioned British Patent No. 146,517, accepted ctober 5, 1921.

lill hen sequence switch 350 passes through position 10, a circuit completedffrom battery through the winding o'l relay 339, conductor 362. contact 365 (10), front Contact and lett-hand armature oit relay 333, to ground at contact 339.' Relay 339 attracts i.: armature and opens the above traced circuit for relay 222. Relay 222 deenergizes and closes a circuit "from battery through the winding oi' sequence switch 220, contact 251 (9), back contact and armature of vrelay 222 to ground at back contact and armature ot relay 231. Sequence switch 220 moves into position 10, where completed to drive it into position 11. This circuit leads trom battery through the wind- (7), contact and switch 220 leaves position 13, it

a circuit is ing ot said sequence switch, contact 253 (l0) to ground at the baclr contact and armature or supervisory relay 262. When sequence switch 220 reaches position 10, the calling subscribers line -is disconnected troni the register controlling equipment and, is ertended over cont-acts 221 and 223 through to the cord circuit of the group selector. delay 231 and retardation coil 237 are therefore energized in series with the calling line. The register controlling equipment being disconnected, is now restored to its normal position ready to be taken :tor use in connection with a subsequent call in the manner described in the above-mentioned British Patent No. 146,517, accepted October' 5, 1921.

lt the called line is found idle and the called. subscriber responds, relay 262 is energized in series with the line. By attracting its armature this relay closes a circuit over contact 225 (11) to drive sequence switch 220 into position 12, which is the talking position thereof.

rt the termination of the conversation the calling subscriber replaces the receiver on the switchhool, which opens the circuit ot relay 231. Relay 231 deenergizing, closes a circuit trom battery through the winding l ot sequence switch 220, contact- 251 (12), back contact and armature of relay 222 to ground at the baclr contact and armature ott relay` 231. Sequence switch 220 moves out ot position 12, over position 13 and into` po-` sition 17. A. circuit is then closed from battei-y through the winding of the brush carriage power magnet 241, Contact 227 (17), back contact and armature of relay 232, contact 211 (17) to ground at Contact 281. The brush carriage is rotated back to its nor mal position where a circuit is closed from battery, contact 229 (17), through the winding oit' relay 232 to ground. The relay 232 energizing, opens the circuit of power mag net 241, bringing the brush carriage to rest and also closes a circuit from battery, through the winding ot sequence switch 220, contact 225 (17 iront contact and armature ot relay 232, Contact 211 (17) to ground at contact 281. Sequence switch 220 thereupon moves out of position 17. vWhen sequence opens' at Contact 212 the hereinbefore traced circuit for relays 120, 119 and and the register magnet 121. Since the call is a local one, this circuit is not closed at any other point and relays 120, 119 and 235 deenergize. As

explained` the magnet 121 `is marginal and,

therelore, is not ope 'ated to charge the call.

lt will now be assumed that the subscriber of substation 10() wishes to obtain a connection with a line belonging to a distant ein change, such as line 235. In this case the designation of the desired line is registered, in the manner described, on the register controlling equipment in the satellite. The

l vlgroup selector atthe satellite-shown iny Figing 'to thedistant vthe establishment of the connection. 'ln the the called exchange to corresponding posi- -Y change becomes effective te control the operi t `the spectic'method. by which setting ot' the satellite register Vspecific desc y trolling; mechanism ,at the-satellite proceeds scribed.

.coniiectedto the cord circuit shown in F register mechanism, the

.at one or more of the contactsLO, 416 and position f5` ure 2 operates. to extendv the calling. subscriberls line over' anzi'dle trunk circuit. leadeXcha-nge .whereupon the satellite register mechanism 'may be ,opertery.; through the 'winding thereof, 'contact ated to directively control the group and eofntactQSS, conductor 269, armature nd 1. .winding Lot'i.,ste'"pping'.relay `355, Contact 356 present arrangement,however, the con-trol- (2)5 't 'gFOilIiCl y line; mechanismv is soV designed that in thecase ot' anrcfutgoing call, the several registers are first restoredfto. their normal vpositions to vcontrol .the setting of similar neigfsterszat i'inal selectors insuch excl-iange tol complete .contact y and armatureof relay 222-110- ground attack Contact antliarniature 0f .relay 231 'to dni-ye se tions. Thereafter the register set atthe eX- ion- 6 the trip spindle magnet 424B i Y l ized ina circuit from' battery I,through the winding i thereoy Acontact i 214 ietf.- Wffidinfr et ,YV relay .276, fm1-1t" Contact and. armature of relay. 222 to aground, V at-back .contact andv armature of relay 231. l `itripspindle rotates vand inpassingthrough the t lbrush tripping position thefiiiterswitches `therein to .cointo the @callezdli-ne.. VSince ation ot the selective plete the connection set ris transferred tothe register set at the'fdisant exchange, `is not concernedv .with .the present invention.,` vit is not considered necessary to go into' afdetailed description of the same. For amore ription, reference is 4'made to the above-mentioned British Patent N 0,146,517 accepted @ctober 5,'51921- f The operation `of the first line iinder, sec ond line finden and the `association with the proper cord A.circuit of an idle registeioontepsliertcircut. the Steering `inlay .3.55 in the fund aniental circuit. Relay .35,5 retracts ;.itsyarinaturefand.closes a circuit romirbattary-to the winding `of sequence switch 350 .fcontactfgtfff A(2), .contact vvand armature and lettfhaiid windingofrelay 3519, back con- -talct and arrltureof relay 355, contact't, te aground yatcontact 451. `The sequence in lprecisely the same manner as already-edey i switfih .I5-'50 immediately passes out of posi- When the register vmechanism is andthe impulse circuit established fromgthe calling line oit' the stepping vrelay @25ct the dialing tone is placed upon the called line to indicate that.. the apparatus is in'4 condition to receive the, registration ofthe called number.A The callt ing subscriberthereupon operates'his dial inf-y 1248 andalso closes aff/ circuit to drive accordance lwith the digits of the-"wanted efr-sequence switch `220 `into position 7.v v l change numbenwhicli, `in etfect,.results' `in llatter circuit may tbe; traced `from battery the transmission Yoi" series oie impulses correspondingto ythe complements of. the digits of such numbers.l In response Vto' these fini-v pulses tlie registers .fl-OO, -el0,.-t20,- 430 .and 440 are positioned.

Since the called numberfis fone belonging to the distant exchange and since, and as al-v ready eXpla-ined, therstfthree registers 400, 410 and 420 are designedto discriminate be-y tween satellite lines and exchange linea-the. preliminary energizing circuit of relays A382 and 383 above traced, will be held open either.

/iig'iesition the @contacts 250 are opened and' `tinidaix-nental circuit'hei 1356. lfheirelay222 releasingits armature,

of sequence :switch 220 the` brushy carriage power magnet 241 is alsoenergized in a "magnet contact 227 (7),. baclrcontactand @armature of (relay 232,l front contactjand -armatuifegof relay 222- tobaok contactaiid l armature of relay l 231 The l brush, carriage v427', when sequence switch 350 Apasses posi-l tion 1%. Hence, when the'iirst `threef'digits have been sent, vand sequence switch/320A passes out of position 8 and ysequence switch. 350 consequently leaves position land moves through Vposition' 19h the 'discriminating relays 382 and 383 remained deenergizedf The sequence switch 350'n0w cornes to. rest in po.

set of brushes 2187,. A219,;and 21.6aretrailedv .over the i terminals ,of..trunlrs, :such as tei'- minals 263,` 2.64-, 265,.leadingto the distant exchange.. i i v Relay 35,5. a1so energizes. #siren-it. Re1ay'2221oses api-reni# ence switch *i 2,20 into p ositien The' l ti-ip .spindle v.reaches itsilrst brush-tripping `openstlie circuit ofthe. trip spindle ,power Y.

vcircuit frein-battery to the windingofsaid .runter Cial-taste 2501er@ momentarily .Closed tion andy into posit-ioii.` As soo/nas the relay 222- is deenergized by reason of the gopeiied at contact i 4This -.through the `winding of sequence switch-i220,

iioV

l i 34.1.0 offsequence-switchf320 In position 7 f ,of gthegroup'selector inta-tes!'and` the :selected i through the "ductor '297, right-hand 'When an idle trunk is found upon the test terminal 265 of which exists a selectable potential, as is well understood, a circuit is `closed over test brush 216, contact 228 (7),

through the right-hand winding of the test vrelay 234, back contact and lower armature *of relay 224, contact 211 (7*), contact 281 to ground, Relay 234 energizes and closes low resistance circuit for its left-hand vwinding and the relay 232, as hereinbefore described. `Relay 232 attracts its armature and closes a circuit including contact 225 v(7), iront contact and armature of relay "engagement with terminals 263, 264 and 2d65.

The fundamental circuit is now exten over contacts 255 and 247 to a register set,

vnot shown, and associated with the rst the distant exchange.

group selector 266 in lin the manner described in the above-mentioned'lritish patent, the exchange register set is positioned in accordance with the setshown in the satelting orp the register set to control the seleclite, and later operates tive .movement of the group selectors 266 and 267 and final selector 268 to extend the calling line into connection with the desired line 235. lf the called line is idle and the called subscriber responds, sequence switch 220 is driven into talking` position 12, in the manner above described.

Returning to the point where brush selec- 'tion takes place at the group selector in the satellite, it will be remembered that rela 276 is included in the circuit o-l:l the 'brusili spindle magnet 248. The relay 276 energizes ,andv closes a circuit from battery winding of relay 277 contact and armature of relay 276, contact 284, conarmature and back 'contact of relay 383, which relay remains deenergized on outgoing calls, sequence switch contact 558 (2) to ground. Relay 277 energizes and locks up in a circuit from -batterythrough its winding, contact and right-hand armature to ground over the two lower contacts indicated at 250. The in- Y terrupter contacts shown at 250 are arrange such that the lower two contacts remain perduring the time the brush manently closed away 'from its normal tripping spindle is position, whereas the upper two contacts i inalr'e Vtemporary 'calling subscriber hangs up closures ask the brush tripping spindle passes from one brush tripping position toA another.

it the end of the conversation, when the his receiver,

the line circuit is opened and relay231 releases lits armature. A circuit is then A12 into position 17.

in' this circuit and sequence switch 220 is battery 259,

inade without charge,

closed from battery, through the winding of 'contact and armature of relay 231 to ground. Sequence switch 220 passesv from position ln moving through positions 14, 15 and 16, the sequence switch 220 closes at its contact 212 the following circuit: positive pole of battery 259, contact and left-hand armature of relay 277, contact 212, upper armature and back contact of relay 224, through the windings ot relays 235 and 119, brush112, terminal 108, through the winding oi` the marginal register magnet 121, to the negative pole oi' battery and ground. The source 0In current 259 being of the proper polarity, adds to the source of current already in series with the register magnet 121, whereby said magnet operates to charge the call against the calling line. Fromv this point on the restoration of the apparatus takes place in exactly the vsaine manner as has hereinbetore been described.

lf the-called line is busy or if the called subscriber fails to answer the sequence switch 220 remains in position 11. When, therefore, the calling subscriber' restores his receiver to the switchhoolc1 and relay 231 deenergizes, a circuit is closed from battery through the upper winding of relay 224, resistance 236, contact 251 (11), back contact `and armature of relay 222, back contact and armature of relay 231 to ground. Relay 224 closes a circuit from battery through the winding of sequence switch 220, lower winding and front contact and armature of relay 224, contact 211 to ground at contact 281. The relay 224 remains energized 105 riven from position 11 into position 17. Since relay 224 has its upperv armature attracted while sequence switch 220 is passing over position 14 to 16, the above traced circuit `for the application ofthe meter isr maintained open and the message register magnet 221' is not operated. Froni here on, release of the apparatus takes place as described.

lt may be desirable in some instances to lprovide for the charging of calls only when certain classes of connections are extended to the exchange. For example, all calls to lines local to the satellite and all calls to lines belonging to the exchange may be while calls extending to the exchange and thence to a. subscribers line in a second or distant eitchange are registered against-:the calling' line. Here, as in the two classes of 'calls 1.25 already considered, the setting of the registers in thesatellite discriminates as to the class of the connection desired and determines whether the message register should i be operated. ln order to make provision llO ff 'registration 'tits aia-ss' calli., the ldwei contact 3,58i's disconnected itr'oni tied firs-'ii exchange vand to a distant r@maisagei Hnallit "lrfctlls",v 'x Q'efver, such' afs' ythose made t`y lilies localy t'o the' satellitev and lines ii to nie'fiisfexeii'ge, contacts 407 and 417. remain opento prevent' the operation of tlieQiiies's'ageieg 'teryx' 1'.' In a' telephone e'zc ange system, a une,

`a AmessageA registerl associated with saidline,

v eration of said switches-,means for varia-bly setting' s'aid registr'niclianism, and means dependent upon the settingl of said mechanism for operating said message register during the release oi' said selective switches.

3. In a telephone exchange system, a line, a message register associated with said line, a plurality of selective switches, means for operating said switches to extend sai-d line, a register controlling mechanism 'for controlling. the selective operation of saidv switches, a sender for Variably setting said e controlling mechanism, and means dependent upon the setting of said mechanism for operating said message register.

4. In a telephone exchange system', a line, a message register associated with said line, a sender associated with said line, selective switches for extendingsaid line, a register controllingmechanism for controlling the operation of said switches, said mechanism comprising a plurality of registers, means under the control of said sender for Variably setting the registers of sai-d controlling mechanism, and means dependent upon the setting of said controlling registers for operating' said message register. e

5. In a telephone exchange system, a line, a message register associated with said line, a sender associated with sai-d line, selective switches for extending said line, a registerv controlling mechanism for controlling the operation of said switches, said mechanism comprising a plurality of registers,'means all' ay ingssage register asso sited 1i'iit'lfisa ality off selec ve s w itfehes 'for'. extend;

tferin'clia'n sn "com i. fr 'fsiapiheexeiiaage means 'for variably setting said mechan'ijsii,

jmetiiisdpenden i'ip'ont the articular set- @sisef iLei, e or line, a register'controlling. controlling the operation of said switches, means for Variably setting said mechanism, means dependent upon the particular lsetico,l

ting of saidy vcontrolling mechanismk for preparing said operating circuit, and meansv operative during the release of said switches for 'eompletingfsaid operating circuit to cause the operation of said message register. w 1

9.1m a ltelephone exchange system, a calling line, called lines divided 'pinto different classes, 'a message register for4 said calling line, selective switches for establishing connections between the calling line and" said called lines, ak register `controlling mechanism for controlling the operation of said,` switches, means for Variably setting said mechanism, means dependent upon the particular setting of said mechanism for distinguishing between `the different `classes of said called lines, and means controlled by"y said lastnamed means for operating said message register.y

l0. In a telephone exchangesystem, fa call-f.l ing line, called 'lines divided into diiferent i classes, a message i register for said calling` line, selectiveswitches for establishing conl nections between'the calling line land said cal-ledflines, `a register controlling mechanism for controlling the operationof said switches, meansjfor yariably setting saidl mechanism, means dependent upon the par-- called lines, and means c'ontrolled'hy said last named means for operating said message register during the release of an established Connection.

l1. ln a telephone exchange system, a switching station, ya calling andvv a called line terminating in said station, a distant switching station, a second called line therein, message register for saidcalling line, selective switches for extending the calling line to either oil' said called lines, a register controllingv mechanism for controlling said switches,l means for Vari-ably setting said mechanism, means dependent upon the setting of said mechanism for distinguishing between a call made to said rst called line and acall made to said second called line,

and means controlled byxsaid last named means vfor operatingsaid message register when a call is made to said second called line. i p c l2. ln a telephone exchange system, a

,switching station, a callingr and a called line terminating in said station, a distant switching` station, a second called line therein, a message register for said calling line,

selective switches for extending the calling `line to. either of said called lines, a reg1ster controlling mechanism for controlling vsaid switches, means yfor Variahly setting .said mechanism, means dependent `upon the setting of said mechanism for distinguishing between a call made to said iirst called line and a call made to said second called line, and means controlled by said last named means for operating said message register during the release of said switches.

i3. ln a telephone exchange system, a line, a message register associated with said line, selective switches 'for 'extending said line, a register controlling mechanism for controlling the operation'` 0-1c said switches, said mechanism comprising a plurality of registers, and means dependent on the `'joint setting ci' said registers for operating vsaid message register.- v

le. ln a telephone exchange system, a line, a message register associated with said line, selective ,switches for extending said line, a register controlling,mechanism comprising a plurality of registers, means ior variahly setting said registers, an operating circuit for said message register7 means dependent on the joint setti-ng of said controlling registers ;tor preparing saidcircuit, means controlled bysaid registers for operating said switches, and means for completing said circuit to cause the operation ot said message register; y

ln. ,witness whereof, I hereunto subscribe my name this 12th d-ay of June A.. D., 1919.

LiPA PoLiNKowsKr. 

